The invention provides a dynamic in-situ gas-
phase reaction tank for a soft X-
ray spectroscopy experiment. The dynamic in-situ gas-
phase reaction tank comprises a reaction tank main body, a reaction tank supporting piece and an external connecting piece. The reaction tank main body is provided with a sample cavity for placing a sample and a
first light through hole communicated with the sample cavity, and a
metal partition plate is arranged in the sample cavity. The reaction tank supporting piece comprises a supporting
pipe, and the supporting
pipe is connected with the reaction tank main body. The external connecting piece comprises a connector, a differential pumping pipeline, an electronic yield
signal line and a bias line, and one end of the bias line sequentially penetrates through the differential pumping pipeline, the connector, the supporting
pipe and the reaction tank main body to be connected with the
metal partition plate. According to the invention, a bias
voltage is applied to the
metal partition plate, so that an
electric field is generated between the sample and the metal partition plate, ionized gas particles are pulled away from the surface of the sample,
background noise is reduced, and collection of
electron yield signals becomes possible; and the reasonable Reynolds coefficient is achieved by reducing the distance between the window and the sample and adjusting the gas flow rate, and therefore it is guaranteed that the gas updating speed on the surface of the material is high.